© Infrastructure Health & Safety Association (IHSA)
44 • Institute for Work & Health (IWH)
Step 3: Calculate the weight.
Convert fractions of an inch to a decimal.
Note: To convert a fraction to decimal inches, always do top ÷ bottom.
⅞" = 7 ÷ 8 = 0.875"
Weight = Area × thickness in inches × unit weight/ft2
= 135.53967 ft² × 0.875" × 40 lbs/ft² = 4 743.88845 lbs
Step 4: Convert lbs to kgs.
1 kg = 2.2 lbs
Note: To convert pounds to kilograms, divide by 2.2.
To convert kilograms to pounds, multiply by 2.2.
4 743.88845 lbs ÷ 2.2 lbs/kg = 2156 kg
